On November 3,1989, a 42 year old cattle ranch foreman was fatally injured while attempting to unload several sections of a portable corral. The fatal accident occurred on a Friday afternoon at approximately 1430 hours. At 1400 hours the victim left the ranch headquarters unaccompanied in a pickup truck towing a gooseneck trailer loaded with 12 metal corral panels. His intention was to set up a portable corral at a leased pasture. The twelve corral panels were wired to one side of the trailer, fastened as a group at each end. When the victim had not returned to ranch headquarters by 1800 hours, two fellow employees were sent to assist him in completion of chores at a second site where the victim should have arrived. When discovering that the victim had not arrived at the site a search was initiated. Shortly after 1900 hours the victim was found at the leased pasture. The victim was inside the trailer pinned against the trailer wall by the portable corral panels. The panels were unwired on the end nearest the rear of the trailer. The victim was found at the point where the second wire had been fastened. It is assumed that when the victim loosened the second wire that the panels tipped towards him and pinned his chest to the opposite wall of the trailer. 1. When portable corral panels are moved, the panels should be secured to the side of the transport vehicles in pairs. 2. Employers should develop and implement comprehensive written safety programs. As part of this safety program, the employer should conduct regular training for all employees.